Model Tracker

Mistral Medium 3.5

Mistral Medium 3.5 is an AI model made by Mistral AI. Mistral AI released it on 28 April 2026. It is generally available.

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Mistral AI

Mistral Medium 3.5 is an AI model made by Mistral AI. Mistral AI released it on 28 April 2026. It is generally available. It takes text, image and returns text. Its context window is 256,000 tokens. Through the API it costs $1.50 per 1M tokens for input and $7.50 per 1M tokens for output. Its weights are open. Its licence is Modified MIT.

Released: 28 April 2026 — docs.mistral.ai, read 16 October 2026
Status: Generally available — docs.mistral.ai, read 16 October 2026
Takes: Text, Image — huggingface.co, read 16 October 2026
Returns: Text — huggingface.co, read 16 October 2026
Open weights: Yes — mistral.ai, read 16 October 2026
Licence: Modified MIT — docs.mistral.ai, read 16 October 2026
Context window: 256,000 tokens — huggingface.co, read 16 October 2026
Longest answer: Not confirmed: The maker's pages reviewed do not state the standard maximum output-token limit for this model.
Knowledge cutoff: Not confirmed: The maker's pages reviewed do not state a knowledge-cutoff date for this model.
API price, input: $1.50 per 1M tokens — docs.mistral.ai, read 16 October 2026
API price, output: $7.50 per 1M tokens — docs.mistral.ai, read 16 October 2026
Where: Not confirmed: two readings disagree: api, app, weights, cloud and api, weights
Parameters: 128,000,000,000 — huggingface.co, read 16 October 2026
Model card: Not confirmed: two readings disagree: https://huggingface.co/mistralai/Mistral-Medium-3.5-128B and https://docs.mistral.ai/models/mistral-medium-3-5-26-04

Benchmarks

Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.

Arena

Text Arena, mistral-medium-3.5: 1,426 (1,420–1,433, 11,778 votes), published 15 October 2026
Code Arena (WebDev), Mistral Medium 3.5: 1,264 (1,250–1,279, 2,316 votes), published 18 October 2026
Vision Arena, mistral-medium-3.5: 1,200 (1,191–1,210, 5,375 votes), published 9 October 2026

Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0

Epoch AI

Epoch Capabilities Index, Mistral Medium 3.5: 141.5 (138.7–144.0), as of 19 October 2026

Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0

Questions

When was Mistral Medium 3.5 released?

Mistral AI released Mistral Medium 3.5 on 28 April 2026.

Is Mistral Medium 3.5 still available?

Yes: it is generally available, as Mistral AI states it.

What is the context window of Mistral Medium 3.5?

The context window of Mistral Medium 3.5 is 256,000 tokens, as Mistral AI prints it.

How much does the Mistral Medium 3.5 API cost?

On the standard tier, Mistral Medium 3.5 costs $1.50 per 1M tokens for input and $7.50 per 1M tokens for output, as Mistral AI lists it.

Are the weights of Mistral Medium 3.5 open?

Yes: Mistral AI publishes the weights of Mistral Medium 3.5 for download.

What is the licence of Mistral Medium 3.5?

The licence of Mistral Medium 3.5 is Modified MIT, as Mistral AI names it.

What does Mistral Medium 3.5 take and return?

Mistral Medium 3.5 takes text, image and returns text.

How many parameters does Mistral Medium 3.5 have?

Mistral Medium 3.5 has 128,000,000,000 parameters, as Mistral AI publishes it.

Sources

Mistral Medium 3.5 - Mistral AI | Mistral Docs (read 16 October 2026)
API pricing (read 16 October 2026)
Remote agents in Vibe. Powered by Mistral Medium 3.5. (read 16 October 2026)
Mistral Medium 3.5 128B (read 16 October 2026)

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